Fix verifyCommits error when push a new branch (#26664) (#26810)

Backport #26664 by @CaiCandong

> ### Description
> If a new branch is pushed, and the repository has a rule that would
require signed commits for the new branch, the commit is rejected with a
500 error regardless of whether it's signed.
> 
> When pushing a new branch, the "old" commit is the empty ID
(0000000000000000000000000000000000000000). verifyCommits has no
provision for this and passes an invalid commit range to git rev-list.
Prior to 1.19 this wasn't an issue because only pre-existing individual
branches could be protected.
> 
> I was able to reproduce with
[try.gitea.io/CraigTest/test](https://try.gitea.io/CraigTest/test),
which is set up with a blanket rule to require commits on all branches.


Fix #25565
Very thanks to @Craig-Holmquist-NTI for reporting the bug and suggesting
an valid solution!

Co-authored-by: CaiCandong <50507092+CaiCandong@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
Giteabot 2023-08-31 23:29:55 +08:00 committed by GitHub
parent 302c03c4a9
commit 93c36f395c
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
43 changed files with 270 additions and 20 deletions

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@ -276,4 +276,12 @@
email: user2-2@example.com
lower_email: user2-2@example.com
is_activated: false
is_primary: false
is_primary: false
-
id: 36
uid: 36
email: abcde@gitea.com
lower_email: abcde@gitea.com
is_activated: true
is_primary: false

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@ -1 +1,23 @@
[] # empty
-
id: 5
owner_id: 36
key_id: B15431642629B826
primary_key_id:
content: 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
verified: true
can_sign: true
can_encrypt_comms: true
can_encrypt_storage: true
can_certify: true
-
id: 6
owner_id: 36
key_id: EE3AF48454AFD619
primary_key_id: B15431642629B826
content: 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
verified: true
can_sign: true
can_encrypt_comms: true
can_encrypt_storage: true
can_certify: true

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@ -1301,7 +1301,7 @@
lower_name: limited_org36
name: limited_org36
full_name: Limited Org 36
email: limited_org36@example.com
email: abcde@gitea.com
keep_email_private: false
email_notifications_preference: enabled
passwd: ZogKvWdyEx:password
@ -1320,7 +1320,7 @@
allow_create_organization: true
prohibit_login: false
avatar: avatar22
avatar_email: limited_org36@example.com
avatar_email: abcde@gitea.com
use_custom_avatar: false
num_followers: 0
num_following: 0

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@ -28,23 +28,31 @@ func verifyCommits(oldCommitID, newCommitID string, repo *git.Repository, env []
_ = stdoutWriter.Close()
}()
var command *git.Command
if oldCommitID == git.EmptySHA {
// When creating a new branch, the oldCommitID is empty, by using "newCommitID --not --all":
// List commits that are reachable by following the newCommitID, exclude "all" existing heads/tags commits
// So, it only lists the new commits received, doesn't list the commits already present in the receiving repository
command = git.NewCommand(repo.Ctx, "rev-list").AddDynamicArguments(newCommitID).AddArguments("--not", "--all")
} else {
command = git.NewCommand(repo.Ctx, "rev-list").AddDynamicArguments(oldCommitID + "..." + newCommitID)
}
// This is safe as force pushes are already forbidden
err = git.NewCommand(repo.Ctx, "rev-list").AddDynamicArguments(oldCommitID + "..." + newCommitID).
Run(&git.RunOpts{
Env: env,
Dir: repo.Path,
Stdout: stdoutWriter,
PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
err := readAndVerifyCommitsFromShaReader(stdoutReader, repo, env)
if err != nil {
log.Error("%v", err)
cancel()
}
_ = stdoutReader.Close()
return err
},
})
err = command.Run(&git.RunOpts{
Env: env,
Dir: repo.Path,
Stdout: stdoutWriter,
PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
_ = stdoutWriter.Close()
err := readAndVerifyCommitsFromShaReader(stdoutReader, repo, env)
if err != nil {
log.Error("%v", err)
cancel()
}
_ = stdoutReader.Close()
return err
},
})
if err != nil && !isErrUnverifiedCommit(err) {
log.Error("Unable to check commits from %s to %s in %s: %v", oldCommitID, newCommitID, repo.Path, err)
}

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@ -0,0 +1,43 @@
// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package private
import (
"context"
"testing"
"code.gitea.io/gitea/models/unittest"
"code.gitea.io/gitea/modules/git"
"github.com/stretchr/testify/assert"
)
var testReposDir = "tests/repos/"
func TestVerifyCommits(t *testing.T) {
unittest.PrepareTestEnv(t)
gitRepo, err := git.OpenRepository(context.Background(), testReposDir+"repo1_hook_verification")
defer gitRepo.Close()
assert.NoError(t, err)
testCases := []struct {
base, head string
verified bool
}{
{"72920278f2f999e3005801e5d5b8ab8139d3641c", "d766f2917716d45be24bfa968b8409544941be32", true},
{git.EmptySHA, "93eac826f6188f34646cea81bf426aa5ba7d3bfe", true}, // New branch with verified commit
{"9779d17a04f1e2640583d35703c62460b2d86e0a", "72920278f2f999e3005801e5d5b8ab8139d3641c", false},
{git.EmptySHA, "9ce3f779ae33f31fce17fac3c512047b75d7498b", false}, // New branch with unverified commit
}
for _, tc := range testCases {
err = verifyCommits(tc.base, tc.head, gitRepo, nil)
if tc.verified {
assert.NoError(t, err)
} else {
assert.Error(t, err)
}
}
}

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@ -0,0 +1,17 @@
// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package private
import (
"path/filepath"
"testing"
"code.gitea.io/gitea/models/unittest"
)
func TestMain(m *testing.M) {
unittest.MainTest(m, &unittest.TestOptions{
GiteaRootPath: filepath.Join("..", ".."),
})
}

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@ -0,0 +1 @@
ref: refs/heads/main

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@ -0,0 +1,6 @@
[core]
repositoryformatversion = 0
filemode = false
bare = true
symlinks = false
ignorecase = true

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@ -0,0 +1 @@
d766f2917716d45be24bfa968b8409544941be32 refs/heads/main

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@ -0,0 +1 @@
0000000000000000000000000000000000000000 d766f2917716d45be24bfa968b8409544941be32 Gitea <gitea@fake.local> 1693148474 +0800 push

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@ -0,0 +1 @@
0000000000000000000000000000000000000000 d766f2917716d45be24bfa968b8409544941be32 Gitea <gitea@fake.local> 1693148474 +0800 push

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@ -0,0 +1,2 @@
x•ŽK
1Ù ÒéüAÄS¸ï$Í"32 ooð®ŠWð òÞ{!žæ`˜JC%¡.˜ $Ár]sѱe$ïmòâMƒ·)£÷±(O`ªbtlÐE[:;4–àHÐ1_û<5F>”rayýáþl“é÷~“ÊE­L@cå€Xv…Mþã":µMÛƒG«_}À?Ý

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@ -0,0 +1,2 @@
x<>1
!ES{ŠéAwGGa 9EúQg W·Èí#¹AªÞû©ÕZ§/£€³Œp±ì(¤(<28>ó®óBhÈÛ¼&áŸãÝ:pLY`ûÍãU†ð-µzŸÁ°ô†×ZM:<3A>†ü¡¨Êå€óxJ/ûG}:µ3

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@ -0,0 +1,3 @@
x•ŽA
Â0E]ç³$™L“ ˆx•L2µ]´<C2B4>
ÞÞê \}ø¼ÿøe[–¹:{êM°õZ5bŠ8$¡Äv ž°fÉRÍ37];Ôˆìbt¡Ò úå3‡$‰,tXœ¨G“÷>m ²”ªpýÅý1wÍ—²-7p<37>½£Ä„p¶ÉZs´Ç±®L̾¾´Íã¤åµLæëe@ó

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@ -0,0 +1,3 @@
xË®«FE3æ+zn%44æ!%Qxƒ<78>Û€s˜AÓ` 8Øæëã{£Ì2IM¶j•ª´¥Údèûf²Ìý2<C3BD>"‡$§e‰¶
-(â ­Ä!´ÝJ"åaŲ@•BaîùHo3 ŸVØòå<$<24>/)å$JøJDB¡•H¤§˜ü{¾ RRðûOù«nfšÿF†þOÀ‰
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x•ŽA
Â0E]ç³$™L“ ˆx•L2µ]´<C2B4>
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@ -0,0 +1 @@
d766f2917716d45be24bfa968b8409544941be32

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@ -0,0 +1,127 @@
# GPG key for abcde@gitea.com
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=OYIo
-----END PGP PUBLIC KEY BLOCK-----
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-----END PGP PRIVATE KEY BLOCK-----